Discovery and perspectives from the blastokinin era

The events and rationalizations that led to one discovery of the rabbit uterine protein, then called blastokinin, are narrated in historical perspective and related to the independent discovery of the same protein, named uteroglobin. The period when the name "blastokinin" remained in partial use, roughly from the original publication in 1967 until the early 1980s, is considered here as the blastokinin era. Subsequent perspectives, originating from the era, are presented on the hormonal regulation of blastokinin, as well as its distribution, biological function, and potential relationships with other entities that exist coincidentally.